A concave mirror of focal length $f$1 is placed at a distance of d from a convex lens of focal length $f$2. A beam of light coming from infinity and falling on this convex lens $-$ concave mirror combination returns to infinity. The distance d must equal

Question

A concave mirror of focal length $f$₁ is placed at a distance of d from a convex lens of focal length $f$₂. A beam of light coming from infinity and falling on this convex lens $-$ concave mirror combination returns to infinity. The distance d must equal

${f_1} + {f_2}$

$-$${f_1} + {f_2}$

2${f_1} + {f_2}$

$-$2${f_1} + {f_2}$

Solution

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